How to enable JIT(Just in time mode) with create react app?

I tried setting up the JIT in create-react-app by myself but it doesn't seem to be working as in the styles are not getting updated. I am using craco to build the app with tailwind css and also added TAILWIND mode=WATCH as they suggested to make it work with most builds . Here are my configs:

tailwind.config.js

module.exports = {
mode: "jit",
purge: ["./src/**/*.{js,jsx,ts,tsx}", "./public/index.html"],
darkMode: false, // or 'media' or 'class'
theme: {
    extend: {
        colors: {
            primary: "#ffa500",
            secondary: {
                100: "#E2E2D5",
                200: "#888883",
            },
        },
    },
},
variants: {
    extend: {
        opacity: ["disabled"],
    },
},
plugins: [],};

package.json scripts

    "scripts": {
    "start": " craco start",
    "build": "TAILWIND_MODE=watch craco build",
    "test": "craco test",
    "server": "nodemon ./server/server.js",
    "eject": "react-scripts eject"
},

package.json devDependencies

"devDependencies": {
    "autoprefixer": "^9.8.6",
    "postcss": "^7.0.36",
    "tailwindcss": "npm:@tailwindcss/postcss7-compat@^2.2.4"
},

I'll be glad if I could get any way to fix this .

Solution

If you are on Windows (as I suspect you might be from your comment on @Ako's answer), then your setup is correct but you just need to install cross-env, then adjust your start script like so:

"start": "cross-env TAILWIND_MODE=watch craco start"